An estimated 33,600 units from BMW and Rolls-Royce will have to have their airbag sensors replaced after the automaker announced that certain models of the 7-Series, 5-Series and Rolls-Royce Ghost have to be recalled.

According to the company, affected models built from December 2011 to June 2012 have a faulty sensor due to a software error in the prodution done by the supplier.

The Rolls-Royce Ghost

BMW added that the sensors send incorrect data to the airbag control unit, which may result in the airbags not deploying in case of a longtitudinal front-end or rear-end crash.

BMW will contact affected owners immediately about the safety recall and will have the units repaired. Replacing the faulty airbag sensor will approximately take three hours and will be free of charge.